<template>
  <div class="search-form">

    <!-- 头部tab切换 -->
    <el-row type="flex"
            class="search-tab">
      <span v-for="(item, index) in tabs"
            :key="index"
            @click="handleSearchTab(item, index)"
            :class="{active: index === currentTab}">
        <i :class="item.icon"></i>{{item.name}}
      </span>
    </el-row>

    <el-form class="search-form-content"
             ref="form"
             label-width="80px">
      <el-form-item label="出发城市">
        <!-- fetch-suggestions 返回输入建议的方法 -->
        <!-- select 点击选中建议项时触发 -->
        <el-autocomplete :fetch-suggestions="queryDepartSearch"
                         v-model="form.departCity"
                         placeholder="请搜索出发城市"
                         @select="handleDepartSelect"
                         class="el-autocomplete"></el-autocomplete>
      </el-form-item>
      <el-form-item label="到达城市">
        <el-autocomplete v-model="form.destCity"
                         :fetch-suggestions="queryDestSearch"
                         placeholder="请搜索到达城市"
                         @select="handleDestSelect"
                         class="el-autocomplete"></el-autocomplete>
      </el-form-item>
      <el-form-item label="出发时间">
        <!-- change 用户确认选择日期时触发 -->
        <el-date-picker type="date"
                        v-model="form.departDate"
                        placeholder="请选择日期"
                        style="width: 100%;"
                        @change="handleDate">
        </el-date-picker>
      </el-form-item>
      <el-form-item label="">
        <el-button style="width:100%;"
                   type="primary"
                   icon="el-icon-search"
                   @click="handleSubmit">
          搜索
        </el-button>
      </el-form-item>
      <div class="reverse">
        <span @click="handleReverse">换</span>
      </div>
    </el-form>
  </div>
</template>

<script>
import moment from 'moment'
export default {
  data () {
    return {
      tabs: [
        { icon: "iconfont icondancheng", name: "单程" },
        { icon: "iconfont iconshuangxiang", name: "往返" }
      ],
      currentTab: 0,
      form: {
        departCity: '',
        departCode: '',
        destCity: '',
        destCode: '',
        departDate: ''

      }
    }
  },
  methods: {
    // tab切换时触发
    handleSearchTab (item, index) {
      if (index === 1) {
        this.$confirm("目前暂不支持往返，请使用单程选票！", '提示', {
          confirmButtonText: '确定',
          showCancelButton: false,
          type: 'warning'
        });
      };
    },

    // 出发城市输入框获得焦点时触发
    // value 是选中的值，cb是回调函数，接收要展示的列表
    // cd函数必须接受一个数组，数组中的每一项必须是一个对象，对象中必须要有value 属性
    queryDepartSearch (value, cb) {
      this.queryCity(value, cb, (arr) => {
        // 默认选择第一个
        this.form.departCity = arr[0].value;
        this.form.departCode = arr[0].sort;
      });
    },

    // 目标城市输入框获得焦点时触发
    // value 是选中的值，cb是回调函数，接收要展示的列表
    queryDestSearch (value, cb) {
      this.queryCity(value, cb, (arr) => {
        // 默认选择第一个
        this.form.destCity = arr[0].value;
        this.form.destCode = arr[0].sort;
      });
    },

    // 出发城市下拉选择时触发
    handleDepartSelect (item) {
      // console.log(item)
      this.form.departCity = item.value;
      this.form.departCode = item.sort;
    },

    // 目标城市下拉选择时触发
    handleDestSelect (item) {
      console.log(item);
      this.form.destCity = item.value;
      this.form.destCode = item.sort;
    },

    // 确认选择日期时触发
    handleDate (value) {
      this.form.departDate = moment(value).format("YYYY-MM-DD");
    },

    // 触发和目标城市切换时触发
    handleReverse () {
      const { departCity, departCode, destCity, destCode } = this.form;
      this.form.departCity = destCity;
      this.form.departCode = destCode;
      this.form.destCity = departCity;
      this.form.destCode = departCode;
    },

    // 提交表单是触发
    handleSubmit () {
      // console.log(this.form);
      // 跳转 // 表单验证数据
      const rules = {
        depart: {
          value: this.form.departCity,
          message: "请选择出发城市"
        },
        dest: {
          value: this.form.destCity,
          message: "请选择到达城市"
        },
        departDate: {
          value: this.form.departDate,
          message: "请选择出发时间"
        },
      };
      // 开关验证
      let valid = true;
      // console.log(Object.keys(rules));
      // 循环判断上面的字段
      Object.keys(rules).forEach(v => {
        if (!valid) {
          return;
        }
        if (!rules[v].value) {
          valid = false;
          this.$message.warning(rules[v].message);
        };

      });
      this.$router.push({
        path: '/air/flights',
        query: this.form
      });
      // 把数据存储在本地
      let airs = JSON.parse(localStorage.getItem('airs')) || [];
      airs.unshift(this.form);
      if(airs.length>5){
        airs.length = 5;
      }
      localStorage.setItem('airs',JSON.stringify(airs));
    },
    // 获取城市
    queryCity (value, cb, fn) {
      if (!value) {
        return;
      };
      this.$axios({
        url: '/airs/city',
        params: { name: value }
      }).then((res) => {
        console.log(res)
        const { data } = res.data;
        const newData = data.map(v => {
          v.value = v.name.replace('市', '');
          return v;
        });
        //  把获取的数据返回
        fn(newData);
        cb(data);
      });
    }
  },
  mounted () {

  }
}
</script>

<style scoped lang="less">
.search-form {
  border: 1px #ddd solid;
  border-top: none;
  width: 360px;
  height: 350px;
  box-sizing: border-box;
}

.search-tab {
  span {
    display: block;
    flex: 1;
    text-align: center;
    height: 48px;
    line-height: 42px;
    box-sizing: border-box;
    border-top: 3px #eee solid;
    background: #eee;
  }

  .active {
    border-top-color: orange;
    background: #fff;
  }

  i {
    margin-right: 5px;
    font-size: 18px;

    &:first-child {
      font-size: 16px;
    }
  }
}

.search-form-content {
  padding: 15px 50px 15px 15px;
  position: relative;

  .el-autocomplete {
    width: 100%;
  }
}

.reverse {
  position: absolute;
  top: 35px;
  right: 15px;

  &:after,
  &:before {
    display: block;
    content: "";
    position: absolute;
    left: -35px;
    width: 25px;
    height: 1px;
    background: #ccc;
  }

  &:after {
    top: 0;
  }

  &:before {
    top: 60px;
  }

  span {
    display: block;
    position: absolute;
    top: 20px;
    right: 0;
    font-size: 12px;
    background: #999;
    color: #fff;
    width: 20px;
    height: 20px;
    line-height: 18px;
    text-align: center;
    border-radius: 2px;
    cursor: pointer;

    &:after,
    &:before {
      display: block;
      content: "";
      position: absolute;
      left: 10px;
      width: 1px;
      height: 20px;
      background: #ccc;
    }

    &:after {
      top: -20px;
    }

    &:before {
      top: 20px;
    }
  }
}
</style>